Leg Muscles: Origin, Insertion, Action, and Comments on Major Muscles, Slides of Anatomy

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Rectus femoris Biceps femoris Vastus lateralis Semitendinosus Vastus medialis Semimembranosus Vastus intermedius

MUSCLES THAT MOVE THE LEG

Origin:

 Anterior inferior iliac spine

Insertion:

 Tibial tuberosity

Action:

 Extend knee  Flex hip

Comment:

 Crosses 2 joints, hip and knee  Sometimes injection site

RECTUS FEMORIS

Origin:

 Greater trochanter

Insertion:

 Tibial tuberosity

Action:

 Extends knee

Comment:

 Lateral aspect of thigh  Sometimes injection site

VASTUS LATERALIS

Origin:

 Linea aspera of femur

Insertion:

 Tibial tuberosity

Action:

 Extends knee

VASTUS MEDIALIS

Origin:

 Ischial tuberosity - LH  Linea aspera - SH  Distal femur - SH

Insertion:

 Head of fibula and tibia

Action:

 Flexes knee  Extends and adducts hip  Laterally rotate thigh

Comments:

 Most lateral of group  2 heads

BICEPS FEMORIS

BICEPS FEMORIS

SEMITENDINOSUS

Origin:

 Ischial tuberosity

Insertion:

 Medial condyle of tibia

Action:

 Flexes knee  Extends thigh

Comment:

 Deep to semitendinosus

SEMIMEMBRANOSUS

HAMSTRING GROUP